# How many moles of gas are in a 4.5 meter cylinder at 105K with a pressure of 2.0atm?

Apr 5, 2018

$n = 1044.53$ $m o l$

#### Explanation:

Assuming that the $4.5$ $m$ you talk about are actually $4.5$ ${m}^{3}$ (so it's the cylinder's volume):

$p V = n R T$

Where:
$p$ is the pressure.
$V$ is the volum.
$n$ is the number of mols.
$R$ is the gas constant.
$T$ is the temperature.

2·4.5=n·8.206·10^(-5)·105

$n = 1044.53$ $m o l$

Note: the gas constant changes with the units you use, if you use ${m}^{3}$, $a t m$, $K$ and $m o l$; it is 8.206·10^(-5). If not, you must check the value it takes.